公开(公告)号：US20220024600A1

公开(公告)日：2022-01-27

申请号：US16934599

申请日：2020-07-21

Applicant: HONEYWELL INTERNATIONAL INC.

Inventor： Lawrence Surace ,  Dereck Clark ,  Christopher Hawley

IPC: B64D31/06 ,  B64C29/00 ,  F01D7/00

Abstract: A noise reduction system in a vertical takeoff and landing (VTOL) vehicle is provided. The noise reduction system is configured to: identify a noise level at which the VTOL vehicle can operate; dynamically determine a motor-specific fan RPM and a motor-specific fan pitch that will allow the vehicle to not exceed the noise level based on vehicle noise characteristics and an ambient noise level; determine whether the determined motor-specific fan RPM and motor-specific fan pitch will allow the vehicle to operate within its safety envelope; and cause a motor-specific fan RPM command and a motor-specific fan pitch command to be sent to the lifter motor controller to cause the vehicle lifter motors to operate at the determined motor-specific fan RPM and motor-specific fan pitch when it is determined that the determined motor-specific fan RPM and motor-specific fan pitch will allow the VTOL vehicle to operate within its safety envelope.